Shock-absorber.



PATENTED MAY 5, 1908.

G. L. HARVEY. SHOCK ABSORBER. APPLICATION FILED DEC. 2, 1905.

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L} e l. ffarz eg v of the energy portions of the UNITED srnrns PATENTOFFICE.

GEORGE LYON HARVEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO HARVEY FRICTIONSPRING COMPANY, OF CHICAGO, ILL

INOIS, A CORPORATION OF ILLINOIS.

SHOCK-ABSORBER,

Specification of Letters Patent.

7 Patented May 6, 1908.

To all whom it may concern:

Be it known that I, GEORGE L. HARVEY,

residing at Chicago, in the county of Cook and State of Illinois, acitizen of the United States, have invented certain new and usefulImprovements in Shock-Absorbers, of which the following is aspecification, reference being had therein to the accompanying drawmgThe invention relates to yielding resistances commonly known as shockabsorbers,

the function of which is to absorb a portion used in deflecting a springto prevent too violent a recoil.

The invention consists in the novel construction of means employed forthis purpose as hereinafter set forth.

In the drawings, Figure 1 is an elevation of a shock absorber inconnection with a vehicle spring illustrated in dotted lines; Fig. 2 isa longitudinal section through the shock absorber; Fig. 3 is a crosssection thereof; Fig. 4 is an elevation of a modified construction; andFig. 5 is a similar view of still another modification.

My improvement comprises essentially a contractible loop anda'cooperating member embraced by said loop in frictional contact uponopposite sides but of a form having a slightly lesser length of of theloop are respectively connected to the movable member and the rigidsupport therefor so that during the movement of the former the loop willbe contracted, thereby being drawn into a closer conformity to thecontour of the cooperating member. During this contraction, thecontracting points or surface of the loop will be pressed with a strongtension against the surface of the cooperating member, so as to cause aconsiderable frictional resistance, and

i frictional resistance will also be oflered to the expansion of theloop when assuming its or1g1nalform.- Thus; a portion of the energyoccaslomng the movement will be absorbed and the recoil correspondinglydiminished.

As illustrated in, Fig. 1, A is .a vehiclespring of any suitableconstruction, it being indicated in the form of an elliptic spring.

B and O are members projecting oppositely from the zipper and lowerportion of said spring and preferably having a telescopic en:

agement with each other. D is the spring loop preferably of slightlyelliptic form and 7 provided with laterally-projecting ends a andcontour.- The ends but at the same time b which respectively engage themembers B and C. E is the cooperating member which as illustrated is ofcircular form and of a size to fit the minor'axes of the ellipse.

For holding the members D and E in proper relation to each other andalso for increasing the bearing surface, provided with a peripheralgroove 0 of a shape corresponding to the cross section of the loop,tllfi's being illustrated as diamond-shaped.

e in any suitable manner to the members B and O, and where desired lostmotion may be provided so as to permit a certain amount of deflection ofthe springbefore the shock absorberis brought into action. This isillustrated in Fig. 1 by sleeving the apertured ends a and b of themember D upona reduced extension (2 of the member C, which latter alsotelescopically engages the member B. In normal position of the spring,the member B is not 'of the loop, but is separated therefrom so as topermit a partial deflection of the spring before a contact is made. As aconsequence, only excessive deflection cause the member B to impinge theends a of the loop and exert a tenslon thereon which 'will cause thecontraction of the 100 Where it is desired, in place of the con"struction illustrated in-Fig. 1, the shock absorber maybe connected tothe spring through the medium of levers such diminish the degree ofcontraction of the loop relative to the movement of the spring. As

the latter is preferably of the spring will as F and G which,

ends a and b of the loop may be attached however in contact with theends a illustrated, thelevers F and G arefulcrumed on pins. projectingfrom the member E and are pivotally connected respectively to the endsof the levers are suitably connected to the opposite sides of the spring(not shown).

In Fig. 5 is illustrated a modification'in which, in place of anabsolutely rigid member E, a spring member E is em loyed which is in theform of a s lit ring. his member E is sufficiently rigi to cause the looD to conform to the same sha e o contour, the mom or E is capable offlexing to a limited extent and will yield under excessive stresses. Theeffect of the construction is therefore to preventa sudden arrest in themovement of deflection and alsoto absorb a portion of the energy byfriction.

From the description above given, the opmember and will be dissipatedthrough conduction and radiation. Y

eration of the shock absorber will be understood; but briefly is asfollows: Whenever pressure is exerted upon the ends of the spring looptending to, contractthe same, this ressurewill also cause the contactisuraces of the members D and E. to be he dtogether and the contractionof'the loop is therefore resisted by the friction betweensaid surfaces.Furthermore, by makingthe angle of the groove 0 slightly sharper thanthe f angular cross section of the loop, a wedging action of the latterinto the former is roduce'd, which will increase the frictionaresistance. The energy used, in overcoming this-resistance will betransformed to heat What I claim as my invention is: J

1 A shock absorber comprising a spring loop having its ends res ectivelyin operative relation to the relatively movable members,

and a nori-rotative cooperating member em-1 1n fr ctional contact bracedby said loop an therewith. l a

2. A shockabsorberc'om rising a spring loop having its opposite" eninthe path of the relatively movable members, and a non.

rotative' cooperating member embraced by said loop of a different form.

3. A shock absorber comprising a contractible loop and a non-rotativecooperating resistance member embraced thereby of 'dif-' ferent contour,the contraction of said loop causing a relative springing andslid ng ofthe contacting surfaces of said members, Wherefaces which arenon-parallel, substantially as described. 6. A shock absorber co'mrising a distortable resilient member an a non-rotative non-resilientmember having engaging frictional surfaces arranged to give increasedfrictional area as the resilient ;member is distorted, substantially asdescribed.

.- 7. A shock absorber comprising a contractible-member and anon-rotative ooop-.

crating resistance member therein having'coactln frictlonal surfacesadapted to frictiona ly resist the contraction of said contractiblemember and to increase said resistance as 'said contraction isincreased.

In testn'n'onywhereof I affix my signature @in' presence of twowitnesses.

, GEORGE LYON HARVEY.

Witnesses:

JAMES P. BARRY,

EDWARD AUL r.

